21061792 has 24 divisors (see below), whose sum is σ = 41580000. Its totient is φ = 10501824.

The previous prime is 21061783. The next prime is 21061819. The reversal of 21061792 is 29716012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21061792.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15309 + ... + 16627.

It is an arithmetic number, because the mean of its divisors is an integer number (1732500).

Almost surely, 2^21061792 is an apocalyptic number.

It is an amenable number.

21061792 is a deficient number, since it is larger than the sum of its proper divisors (20518208).

21061792 is a wasteful number, since it uses less digits than its factorization.

21061792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828 (or 1820 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 21061792 is about 4589.3128025882. The cubic root of 21061792 is about 276.1627549475.

The spelling of 21061792 in words is "twenty-one million, sixty-one thousand, seven hundred ninety-two".